學習筆記專區

package servletApi.action;

package servletApi.action;

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

package model;

tomcat 的 server.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:textSize="20sp"
        android:textColor="#0000FF"
        android:text="@string/photos" />

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

每一個項目(item)的選項內容
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView android:id="@+id/imageView"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:contentDescription="@string/img_desc"
        android:padding="6dp" />

    <TextView android:id="@+id/textView"
        android:layout_gravity="center_vertical"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:padding="6dp" />

</LinearLayout>

package com.lcpan.listview;

import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    //A view that shows items in a vertically scrolling list. The items come from the ListAdapter associated with this view.

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViews();//因為現在程式碼很大了，所以寫在方法裡，呼叫方法
    }

    private void findViews() {
        listView = (ListView) findViewById(R.id.listView);
        listView.setAdapter(new MyAdapter(MainActivity.this)); //把MyAdapter指定給ListView元件
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,int position, long id) {//
                // 選定某個選項（item）時會呼叫此方法
                // view代表被點選的元件,在此為listview_item.xml的LinearLayout元件(也可以說就是整個listview_item.xml)
                TextView textView = (TextView) ((LinearLayout) view).getChildAt(1);
                //指listview_item.xml的LinearLayout元件中的第二個元素TextView android:id="@+id/textView"
                Toast.makeText(getApplicationContext(), textView.getText(),
                        Toast.LENGTH_SHORT).show();//出現彈跳視窗
            }
        });
    }

    private class MyAdapter extends BaseAdapter {//由於繼承BaseAdapter，所以得覆寫四種方法
        //Adapter是一個轉接器，接收資料、丟出資料
        private LayoutInflater layoutInflater;//Inflater：解壓縮、產生器
        private Integer[] images = {//把圖片放入陣列中
                R.drawable.p01, R.drawable.p02, R.drawable.p03, R.drawable.p04,
                R.drawable.p05, R.drawable.p06, R.drawable.p07, R.drawable.p08,
                R.drawable.p09, R.drawable.p10, R.drawable.p11, R.drawable.p12
        };

        public MyAdapter(Context context) {//建構子，建立一個layout物件
            layoutInflater =
                    (LayoutInflater) context.getSystemService(LAYOUT_INFLATER_SERVICE);
        }

        private class ViewHolder {
            ImageView imageView;
            TextView textView;
        }

        @Override //取得資料數量(12張照片)，也就是內容有多少個item
        public int getCount() {
            return images.length;
        }

        @Override //???不用動，position從0開始
        public Object getItem(int position) {
            return position;
        }

        @Override //???不用動
        public long getItemId(int position) {
            return position;
        }

        @Override //系統互依據getCount()的回傳值決定呼叫此方法的次數，第一次呼叫時position=0，第二次=1
        //每回呼叫getView都要配置好每個item的內容，應該類似迴圈
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder viewHolder;//ViewHolder是自己寫的方法
            // convertView為上次呼叫getView()所取得的View，指的是listView元件每個item的layout物件
            if (convertView == null) {// 若convertView已存在,就無需再呼叫inflate()(解壓縮)重新產生它
                convertView = layoutInflater.inflate(R.layout.listview_item, null);//null→預設最外層的layout
        //                inflate(int resource, ViewGroup root)
        //                Inflate a new view hierarchy from the specified xml resource.
                //指定listview_item以產生convertView
                viewHolder = new ViewHolder();
                viewHolder.textView = (TextView) convertView.findViewById(R.id.textView);
                viewHolder.imageView = (ImageView) convertView.findViewById(R.id.imageView);
                // 利用setTag()將convertView和viewHolder建立View元件之間的階層關聯
                // convertView為父元件,而viewHolder為子元件
                convertView.setTag(viewHolder);//把viewHolder跟convertView綁在一起
            } else {
                viewHolder = (ViewHolder) convertView.getTag();//取出之前放在裡面的東西
            }
            viewHolder.imageView.setImageResource(images[position]);
            viewHolder.textView.setText("image " + (position + 1));
            return convertView;
        }
    } // end of class MyAdapter

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.iii.lcpan.activity">

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".NextActivity"></activity>
</application>
</manifest>

<resources>
    <string name="app_name">Activity</string>
    <string name="cel_lbl">攝氏：</string>
    <string name="fah_lbl">華氏：</string>
    <string name="btn_lbl">轉換成華式</string>
    <string name="msg">必須輸入值</string>
    <string name="lastpage">回上頁</string>
</resources>

第一頁：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.iii.lcpan.cf2.MainActivity">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="@string/cel_lbl" />
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="numberDecimal"
            android:ems="10"
            android:id="@+id/celsius" />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/btn_lbl"
            android:id="@+id/submit" />
    </LinearLayout>
</RelativeLayout>

第二頁：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.iii.lcpan.activity.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="@string/fah_lbl"
        android:id="@+id/fahrenheit" />


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/lastpage"
        android:id="@+id/lastpage"
        android:layout_marginTop="91dp"
        android:layout_below="@+id/fahrenheit"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

package com.iii.lcpan.activity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {//implements View.OnClickListener {
    private EditText cel;
    private Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        cel = (EditText) findViewById(R.id.celsius);
        btn = (Button) findViewById(R.id.submit);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    double f = (Double.parseDouble(cel.getText().toString())) * 9 / 5 + 32;
                    Intent intent = new Intent(MainActivity.this, NextActivity.class); //Intent(意圖)使用Bundle物件來傳送資料(本頁,要傳去的那頁)
                    Bundle bundle = new Bundle();
                    bundle.putDouble("f", f);
                    intent.putExtras(bundle);
                    startActivity(intent);
                } catch (Exception e) {
                    Toast.makeText(MainActivity.this, R.string.msg, Toast.LENGTH_LONG).show();

                }


            }
        });
    }

}

package com.iii.lcpan.activity;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class NextActivity extends AppCompatActivity {//implements View.OnClickListener
    private Button btn;
    private TextView fah;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.next);

        fah = (TextView) findViewById(R.id.fahrenheit);
        Bundle bundle = getIntent().getExtras();
        double f = bundle.getDouble("f");
        fah.setText(getText(R.string.fah_lbl) + (Double.valueOf(f).toString()));

        btn = (Button) findViewById(R.id.lastpage);
//        btn.setOnClickListener(this);
        btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                finish();
            }
        });
    }
}

資料夾呈現方式先改成project，之後建立特定資料夾(注意檔案名稱)，並在各資料夾中放他們的string.xml檔